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How do you find the magnitude and direction of unknown forces for a concurrent force

How do you find the magnitude and direction of unknown forces for a concurrent force system in equilibrium?

For a 2-dimensional problem you have three equations of equilibrium:

$<br /> \sum F_x = 0\\<br /> \sum F_y = 0\\<br /> \sum M = 0<br />$

use these to determine the unknown force and/or moment that keeps the system in equilibrium.

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